dbh_load will load a record using the currently set key.
This function will also load erased values, except that it will return 0.
dbh_load_address will load a record from hash table directly from byte offset
currentseek.dbh_load_parent will load the parent of the currently loaded record.
dbh_load_child will load the first child of the currently loaded record, on branch
identified by
key_index. Since the number of childs (or branches) of each record is variable,
this may be tricky. Top level records have DBH_KEYLENGTH branches.
Lower level records have less. Each byte of a key represents a branch
on top level records.